package 笔试;

import java.util.*;

public class 烤串 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while(scan.hasNext()) {
            int n = scan.nextInt();
            scan.nextLine();
            String A = scan.nextLine();
            String B = scan.nextLine();
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < n; i++) {
                sb.append(A.charAt(i));
                sb.append(B.charAt(i));
            }
            System.out.println(sb.toString());
        }

    }
}
